Polarization null angle (PNA) method is an accurate alternative to the commonly used polarization intensity ratio method in determination of molecular orientation at interfaces with sum frequency generation vibrational spectroscopy (SFG-VS). Here, the accuracy and sensitivity of PNA method is tested on different experimental configurations. It is found that its accuracy and sensitivity are more sensitive to the incident angle of the visible beam than the IR beam, and the range of the optimal experimental configurations is identified. This development makes better understanding of the polarization measurement in SFG-VS, and 首ld find more applications for interface studies. 表面和頻光譜分析系統(tǒng)(SFG) PL2230系列高能量全固態(tài)鎖模皮秒Nd:YAG激光器 Ekspla CARS 相干反斯托克斯拉曼顯微光譜儀